ETSI TS V ( )

Transcription

1 TS V ( ) TECHNICAL SPECIFICATION Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; IP Multimedia Subsystem (IMS); Stage 2 (3GPP TS version Release 14)

2 1 TS V ( ) Reference RTS/TSGS ve60 Keywords GSM,LTE,UMTS 650 Route des Lucioles F Sophia Antipolis Cedex - FRANCE Tel.: Fax: Siret N NAF 742 C Association à but non lucratif enregistrée à la Sous-Préfecture de Grasse (06) N 7803/88 Important notice The present document can be downloaded from: The present document may be made available in electronic versions and/or in print. The content of any electronic and/or print versions of the present document shall not be modified without the prior written authorization of. In case of any existing or perceived difference in contents between such versions and/or in print, the only prevailing document is the print of the Portable Document Format (PDF) version kept on a specific network drive within Secretariat. Users of the present document should be aware that the document may be subject to revision or change of status. Information on the current status of this and other documents is available at If you find errors in the present document, please send your comment to one of the following services: Copyright Notification No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm except as authorized by written permission of. The content of the PDF version shall not be modified without the written authorization of. The copyright and the foregoing restriction extend to reproduction in all media All rights reserved. DECT TM, PLUGTESTS TM, UMTS TM and the logo are trademarks of registered for the benefit of its Members. 3GPP TM and LTE are trademarks of registered for the benefit of its Members and of the 3GPP Organizational Partners. onem2m logo is protected for the benefit of its Members. GSM and the GSM logo are trademarks registered and owned by the GSM Association.

3 2 TS V ( ) Intellectual Property Rights Essential patents IPRs essential or potentially essential to the present document may have been declared to. The information pertaining to these essential IPRs, if any, is publicly available for members and non-members, and can be found in SR : "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to in respect of standards", which is available from the Secretariat. Latest updates are available on the Web server ( Pursuant to the IPR Policy, no investigation, including IPR searches, has been carried out by. No guarantee can be given as to the existence of other IPRs not referenced in SR (or the updates on the Web server) which are, or may be, or may become, essential to the present document. Trademarks The present document may include trademarks and/or tradenames which are asserted and/or registered by their owners. claims no ownership of these except for any which are indicated as being the property of, and conveys no right to use or reproduce any trademark and/or tradename. Mention of those trademarks in the present document does not constitute an endorsement by of products, services or organizations associated with those trademarks. Foreword This Technical Specification (TS) has been produced by 3rd Generation Partnership Project (3GPP). The present document may refer to technical specifications or reports using their 3GPP identities, UMTS identities or GSM identities. These should be interpreted as being references to the corresponding deliverables. The cross reference between GSM, UMTS, 3GPP and identities can be found under Modal verbs terminology In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and "cannot" are to be interpreted as described in clause 3.2 of the Drafting Rules (Verbal forms for the expression of provisions). "must" and "must not" are NOT allowed in deliverables except when used in direct citation.

4 3 TS V ( ) Contents Intellectual Property Rights... 2 Foreword... 2 Modal verbs terminology... 2 Foreword Scope References Definitions, symbols and abbreviations Definitions Symbols Abbreviations IP multimedia subsystem concepts General Relationship to CS domain and the IP-Connectivity Access Network IMS services concepts Home-network based services Support of CAMEL or IN Support of OSA Dynamic services interactions handling Service information exchanged between Application Servers Handling by the Application Server Deletion of services interaction information Support of numbers in non-international format in the IMS Support of roaming users IP multimedia Subsystem Service Control Interface (ISC) a HSS to service platform Interface b S-CSCF Service Control Model c I-CSCF to AS reference point (Ma) The QoS requirements for an IM CN subsystem session QoS Requirements for IM CN subsystem signalling Support of SIP forking SIP Forking Forking within and outside the IM CN Subsystem Support for forked requests Naming and addressing concepts Address management Void Identification of users General Private User Identities Public User Identities a Globally Routable User Agent URI (GRUU) a.1 Architecture Requirements b Wildcarded Public User Identity Routing of SIP signalling within the IP multimedia subsystem a Handling of dialled number formats b Termination of session with the TEL URI format Public User Identity Relationship of Private and Public User Identities Relationship of Public User Identities, GRUUs, and UEs Identification of network nodes E.164 address to SIP URI resolution in an IM CN subsystem ENUM/DNS translation mechanism Handling of Tel URIs Handling of SIP URIs representing a telephone number Public Service Identities... 44

5 4 TS V ( ) 4.4 Signalling concepts Mobility related concepts Roles of Session Control Functions General Proxy-CSCF Interrogating-CSCF General Void Serving-CSCF Breakout Gateway Control Function Void Multimedia Resource Function a Media Resource Broker Security Concepts Charging Concepts IMS group management concepts General IMS group administration Group identifiers Relationship to 3GPP Generic User Profile (GUP) Network Address Translation traversal in access network Identification of IMS communication Services General Identification of IMS communication Services Identification of IMS applications Border Control concepts IMS in transit network scenarios General concepts IMS transit network configurations Providing IMS application services in transit network scenarios a Roaming Architecture for Voice over IMS with Local Breakout b Roaming Architecture for Voice over IMS with home routed traffic Support of multimedia telephony Telephony Application Server Identification of multimedia telephony Session setup principles Support of short message service IP Short Message Gateway (IP-SM-GW) Support of Number portability Number portability Support of Preferred Circuit Carrier Access and Per Call Circuit Carrier Selection Preferred Circuit Carrier Access and Per Call Circuit Carrier Selection Support of IMS Service Centralization and Continuity Support of Overlap Signalling Support of Explicit Congestion Notification (ECN) General CS GERAN/UTRAN Interworking at MGCF/IM-MGW Interworking with non-ecn IP network and/or terminal at IBCF/TrGW Interworking with non-3gpp ECN IP terminal at IBCF/TrGW ECN support at IMS-ALG/IMS-AGW ECN support at MRFC/MRFP CS GERAN/UTRAN Interworking at the MSC Server enhanced for ICS/MSC Server enhanced for SRVCC with SIP/CS-MGW Support of Load Balancing General Registration-based load balancing of S-CSCFs Registration independent load balancing of Transit Functions Support of Restoration Procedures Support of Overload Control General Next-hop monitoring of overload Filter based Overload Control... 65

6 5 TS V ( ) 4.26 Support for Business Trunking IP multimedia subsystem procedures General a Session-unrelated procedures CSCF related procedures Establishing IP-Connectivity Access Network bearer for IM CN Subsystem Related Signalling Procedures related to Proxy-CSCF discovery General DHCP/DNS procedure for P-CSCF discovery Void Procedures related to Serving-CSCF assignment Assigning a Serving-CSCF for a user Cancelling the Serving-CSCF assignment Void Procedures related to Interrogating-CSCF Procedures related to Proxy-CSCF Subscription Updating Procedures General Subscription updating information flow Application level registration procedures General Requirements considered for registration a Implicit Registration a.0 General a.1 Implicit Registration for UE without ISIM or IMC Registration flows Requirements to consider for registration Assumptions Registration information flow User not registered Re-Registration information flow User currently registered Stored information Application level de-registration procedures Mobile initiated de-registration Network initiated de-registration General Network Initiated Application (SIP) De-registration, Registration Timeout Network Initiated Application (SIP) De-registration, Administrative General Network Initiated De-registration by HSS, administrative Network Initiated De-registration by Service Platform Procedures for IP multi-media sessions General Bearer interworking concepts Interworking with Internet a IP version interworking Interworking with PSTN Requirements for IP multi-media session control Session Path Information Session Path Information during Registration and Session Initiation P-CSCF in the Session Path S-CSCF in the Session Path End-user preferences and terminal capabilities General Objectives End-user expectations Mechanism for bearer establishment Session progress indication to the originating UE Interaction between QoS and session signalling General Authorize QoS Resources a Resource Reservation with Policy and Charging Control... 90

7 6 TS V ( ) Enabling of Media Flows Disabling of Media Flows Revoke Authorization for IP-Connectivity Access Network and IP Resources Indication of IP-Connectivity Access Network bearer release Authorization of IP-Connectivity Access Network bearer modification Indication of IP-Connectivity Access Network bearer modification Sharing of Resources for Network Detected Concurrent Sessions Network Detected Concurrent Sessions Initiating Resource Sharing for Network Detected Concurrent Sessions Void Priority sharing for concurrent sessions QoS-Assured Preconditions Event and information distribution General Subscription to event notifications Void Signalling Transport Interworking Configuration and Routing principles for Public Service Identities General PSIs on the originating side PSIs on the terminating side Subdomain based PSIs PSI configuration in the HSS Requests originated by the AS hosting the PSI Transcoding concepts a Overview of session flow procedures a.1 End-to-End session flow procedures a.2 Transit network session flow procedures Serving-CSCF/MGCF to serving-cscf/mgcf procedures General (S-S#1) Different network operators performing origination and termination (S-S#2) Single network operator performing origination and termination (S-S#3) Session origination with PSTN termination in the same network as the S-CSCF (S-S#4) Session origination with PSTN termination in a different network from the S-CSCF Origination procedures General (MO#1) Mobile origination, roaming (MO#2) Mobile origination, home (PSTN-O) PSTN origination (NI-O) Non-IMS Origination procedure from an external SIP client Application Server Origination Procedure (AS-O) Origination at Application Server Void S-CSCF selection by I-CSCF for AS Originating call procedures Termination procedures General (MT#1) Mobile termination, roaming (MT#2) Mobile termination, home a (MT#3) Mobile termination, CS Domain roaming (PSTN-T) PSTN termination (NI-T) Non-IMS Termination to an external SIP client (AS-T#1) PSI based Application Server termination direct (AS-T#2) PSI based Application Server termination indirect (AS-T#3) PSI based Application Server termination DNS routing (AST#4) Termination at Application Server based on service logic a Procedures for the establishment of sessions without preconditions a.1 General a.2 Procedures for the establishment of sessions without preconditions - no resource reservation required before session becomes active a.3 Void Procedures related to routing information interrogation General

8 7 TS V ( ) User identity to HSS resolution SLF on register SLF on UE invite SLF on AS access to HSS Routing of mid-session signalling Session release procedures General Terminal initiated session release PSTN initiated session release Network initiated session release Removal of IP-CAN bearers used to transport IMS SIP signalling Network initiated session release - P-CSCF initiated General Network initiated session release - P-CSCF initiated after removal of IP-Connectivity Access Network bearer Void Network initiated session release - S-CSCF Initiated Procedures to enable enhanced multimedia services Session Hold and Resume Procedures General Mobile-to-Mobile Session Hold and Resume Procedures Mobile-initiated Hold and Resume of a Mobile-PSTN Session PSTN-initiated Hold and Resume of a Mobile-PSTN Session Procedures for anonymous session establishment General Signalling requirements for anonymous session establishment Bearer path requirements for anonymous session establishment Procedures for codec and media characteristics flow negotiations General Codec and media characteristics flow negotiation during initial session establishment Codec or media characteristics flow change within the existing reservation Codec or media characteristics flow change requiring new resources and/or authorization Sample MM session flow - addition of another media Procedures for providing or blocking identity General Procedures for providing the authenticated identity of the originating party Procedures for blocking the identity of the originating party Procedures for providing the authenticated identity of the originating party (PSTN origination) Procedures for providing the authenticated identity of the originating party (PSTN termination) Session Redirection Procedures General Session Redirection initiated by S-CSCF to IMS Session Redirection to PSTN Termination (S-CSCF #2 forwards INVITE) a Session Redirection to PSTN Termination (REDIRECT to originating UE#1) Session Redirection initiated by S-CSCF to general endpoint (REDIRECT to originating UE#1) Session Redirection initiated by P-CSCF Session Redirection initiated by UE Session Redirection initiated by originating UE#1 after Bearer Establishment (REDIRECT to originating UE#1) Session Transfer Procedures General Refer operation Application to Session Transfer Services General Blind Transfer and Assured Transfer Consultative Transfer Three-way Session Mobile Terminating call procedures to unregistered Public User Identities General Mobile Terminating call procedures to unregistered Public User Identity that has services related to unregistered state

9 8 TS V ( ) Mobile Terminating call procedures to unregistered Public User Identity that has no services related to unregistered state IMS Emergency Sessions Interactions involving the MRFC/MRFP General Interactions between the UE and the MRFC Service control based interactions between the MRFC and the AS Interactions for services using both the Ut interface and MRFC capabilities Transcoding services involving the MRFC/MRFP Mobile Terminating session procedure for unknown user General Unknown user determined in the HSS Unknown user determined in the SLF IMS messaging concepts and procedures General Immediate Messaging General Procedures to enable Immediate Messaging General Immediate messaging procedure to registered Public User Identity Immediate messaging procedure to unregistered Public User Identity Immediate messages with multiple recipients Session-based Messaging General Architectural principles Procedures to enable Session based Messaging General Session based messaging procedure to registered Public User Identity Session based messaging procedure using multiple UEs Session based messaging procedure with an intermediate node Session based messaging release procedure Session based messaging release procedure with an intermediate node Refreshing sessions Void Support for Transit scenarios in IMS General Providing IMS application services in transit network scenarios Procedures for Assigning, Using, and Processing GRUUs UE Obtaining a GRUU during registration Using a GRUU Using a GRUU while requesting Privacy Serving-CSCF Allocating a GRUU during registration Using a GRUU Interrogating-CSCF a HSS Elements other than UE acting as a UA Using a GRUU Assigning a GRUU IMS Multimedia Priority Services Procedures Support of Overload Control Next-hop monitoring of overload Filter based Overload Control Annex A (Informative): Annex B (Informative): Annex C (Informative): Annex D (Informative): Information flow template Void Void Void

10 9 TS V ( ) Annex E (Normative): IP-Connectivity Access Network specific concepts when using GPRS and/or EPS to access IMS E.0 General E.1 Mobility related concepts E.1.0 General E.1.1 Procedures for P-CSCF discovery E General E GPRS/EPS procedure for P-CSCF discovery E.1.2 Support for Enhanced Coverage for data centric UEs E.2 QoS related concepts E.2.1 Application Level Signalling for IMS E General E QoS Requirements for Application Level Signalling E Requirements for IM CN subsystem signalling flag E Application Level Signalling support for IMS services E.2.1a PDP context/eps Bearer procedures for IMS E.2.1a.1 Establishing PDP Context/EPS bearer for IM CN Subsystem Related Signalling E.2.1a.2 Deletion of PDP Context/EPS bearer used to transport IMS SIP signalling E.2.2 The QoS requirements for an IM CN subsystem session E General E Relation of IMS media components and PDP contexts/eps bearers carrying IMS media E.2.3 Interaction between GPRS/EPS QoS and session signalling E General E Resource Reservation with Policy and Charging Control E.2.4 Network initiated session release - P-CSCF initiated E General E Network initiated session release - P-CSCF initiated after loss of radio coverage E.3 Address and identity management concepts E.3.1 Deriving IMS identifiers from the USIM E.4 Void E.5 IP version interworking in IMS E.6 Usage of NAT in GPRS/EPS E.7 Retrieval of Network Provided Location Information in GPRS/EPS E.8 Geographical Identifier E.9 Support for Paging policy differentiation for IMS services Annex F (Informative): Annex G (Normative): Routing subsequent requests through the S-CSCF Reference Architecture and procedures when the NAT is invoked between the UE and the IMS domain G.1 General G.1.1 General requirements G.2 Reference models G.2.1 IMS-ALG and IMS Access Gateway model G.2.2 ICE and Outbound reference model G.3 Network elements for employing the IMS-ALG and IMS Access Gateway G.3.1 Required functions of the P-CSCF G.3.2 Required functions of the IMS Access Gateway G.3.3 Iq reference point G.4 Procedures for employing the IMS-ALG and IMS Access Gateway G.4.1 General G.4.2 NAT detection in P-CSCF G.4.3 Session establishment procedure

11 10 TS V ( ) G.4.4 G.4.5 G.4.6 Session release procedure Session modification Media forwarding in the IMS Access Gateway G.5 Network elements for employing NAT Traversal for ICE and Outbound G.5.1 General requirements G.5.2 ICE G Overview G Required functions of the UE G Required functions of the STUN relay server G Required functions of the STUN server G.5.3 Outbound G Overview G Required functions of the P-CSCF G Required functions of the S-CSCF G Required functions of the UE G.6 Procedures for employing ICE and Outbound G.6.1 Flow establishment procedures G.6.2 Session establishment procedures G.6.3 Session release procedures G.6.4 Session modification procedures G.6.5 Policy and Charging Control procedures G.6.6 Detection of NAT Traversal support G.6.7 Procedures at other IMS entities processing SDP Annex H (Informative): Annex I (Normative): Example HSS deployment Border Control Functions I.1 General I.2 Overall architecture I.3 Border Control Functions I.3.1 IP version interworking I Originating Session Flows towards IPv4 SIP network I Terminating Session Flows from IPv4 SIP network I.3.2 Configuration independence between operator networks I.3.3 Transcoding Support for Interworking I General I Session Flows I Proactive transcoding support I Reactive transcoding support Annex J (Informative): Dynamic User Allocation to the Application Servers J.1 General J.2 Representative AS J.2.1 Concept of Representative AS J.2.2 Procedures related to Representative AS J.3 Dynamic assignment of AS by S-CSCF caching J.3.1 Concept of Dynamic assignment of AS by S-CSCF caching J.3.2 Procedures related to Dynamic assignment of AS by S-CSCF caching Annex K (Normative): Inter-IMS Network to Network Interface between two IM CN subsystem networks K.1 General K.2 Overall architecture Annex L (Normative): Aspects for use of Common IMS in 3GPP2 systems

12 11 TS V ( ) L.1 General L.2 Definitions L.2.1 HSS L.3 Mobility related concepts when using 3GPP2 Packet Data Subsystem L.3.1 General L.3.2 Procedures for P-CSCF discovery L.4 QoS related concepts when using 3GPP2 Packet Data Subsystem L.5 IP version support in IMS when using 3GPP2 Packet Data Subsystem L.6 Address and identity management concepts L.6.1 Deriving IMS identifiers L.7 Relationship to 3GPP Generic User Profile (GUP) Annex M (Informative): IMS Local Breakout M.1 P-CSCF located in visited network M.1.1 Description M General M Architecture M Flow for originating session M.2 P-CSCF located in home network M.2.1 Description M General M Architecture M Flow for originating session M.2.2 Address assignment M.2.3 IPv4 - IPv6 interworking M.2.4 NAT traversal M.3 P-CSCF located in visited network and with VPLMN loopback possibility M.3.1 Description M General M Architecture M Flow for originating session with VPLMN routing M Flow for originating session with Home routing M.3.2 Interaction with SRVCC and ICS Annex N (Normative): Aspects for use of Common IMS in Fixed xdsl, Fiber and Ethernet based systems N.1 Origination procedures N.1.1 (FO#1) Fixed xdsl origination, home N.2 Termination procedures N.2.1 (FT#1) Fixed xdsl termination, home N.3 Geographical Identifier Annex P (Informative): Transcoding Support involving the MRFC/MRFP P.1 General P.1.1 Scope P.1.2 Description P.1.3 Session flows P General P Proactive transcoding invocation P Reactive transcoding invocation Annex Q (Normative): Optimal media routing Q.1 General

13 12 TS V ( ) Q.2 Procedures and flows Q.2.1 SDP extension Q.2.2 General IMS-ALG procedures Q.2.3 Common flows Q IMS-ALG allocates a TrGW Q IMS-ALG does not allocate a TrGW Q IMS-ALG bypasses its TrGW and one or more prior TrGWs Q IMS-ALG bypasses its TrGW using secondary realm from prior IMS-ALG Q IMS-ALG bypasses one or more prior TrGWs using a secondary realm Q IMS-ALG bypasses TrGWs performing NAT traversal Q.2.5 Flows with transcoding Q Proactive transcoding where transcoding is required Q Proactive transcoding where transcoding not required Q IMS-ALG bypasses prior unrequired proactive transcoder Q IMS-ALG bypasses its TrGW and prior unrequired proactive transcoder Q IMS-ALG replaces prior proactive transcoder Q Proactive transcoding without resource reservation Q Reactive transcoding Q.3 Charging Annex R (Informative): Distribution of Network Provided Location Information within IMS R.1 General R.2 Session Establishment/Modification at Mobile Origination - Location Info in Request R.3 Session Establishment/Modification at Mobile Origination - Location Info in Response R.4 Session Establishment/Modification at Mobile Termination R.5 Session Establishment/Modification - Location Information Distributed by IMS AS R.6 Session Release Annex S (Normative): Business Trunking S.1 General S.2 IP-PBXs using static mode Business Trunking S.2.1 High level architecture S.2.2 High level Flows S General S Originating procedures S Originating procedures using the S-CSCF S Originating procedures using the Transit Function S Terminating Procedures S Terminating procedures using the S-CSCF S Terminating procedures using the Transit Function Annex T (Normative): IP-Connectivity Access Network specific concepts when using Trusted WLAN (TWAN) to access IMS T.0 General T.1 Retrieval of Network Provided Location Information in TWAN access Annex U (Normative): WebRTC access to IMS - network-based architecture U.1 Overview U.1.0 General U.1.1 Assumptions U.1.2 Architecture and reference model U.1.3 Functional entities U WIC (WebRTC IMS Client) U WWSF (WebRTC Web Server Function)

14 13 TS V ( ) U U U U.1.4 U U U U U U.1.5 U U U U U ep-cscf (P-CSCF enhanced for WebRTC) eims-agw (IMS Access GateWay enhanced for WebRTC) WAF (WebRTC Authorisation Function) Reference points W1 (UE to WWSF) W2 (UE to ep-cscf) Iq (ep-cscf to eims-agw) W3 (UE to eims-agw) W4 (WWSF to WAF) Media plane protocol architecture General Protocol architecture for MSRP Protocol architecture for BFCP Protocol architecture for T Protocol architecture for Voice and Video U.2 Procedures U.2.1 Registration U Introduction U WIC registration of individual Public User Identity using IMS authentication U WIC registration of individual Public User Identity based on web authentication U WIC registration of individual Public User Identity from a pool of Public User Identities U.2.2 Session management related procedures U.2.3 De-Registration procedures U.2.4 Media plane Optimization Annex V (Normative): IP-Connectivity Access Network specific concepts when using Untrusted WLAN to access IMS V.1 General V.2 UE Provided Access Information in Untrusted WLAN access Annex W (Normative): Support of IMS Services for roaming users in deployments without IMS-level roaming interfaces W.1 General W.2 Architecture W.3 Subscription to changes in PLMN ID at IMS Initial Registration Annex X (Normative): IMS 3GPP PS Data Off Service Accessibility X.1 General X.2 UE Behaviour X.2.1 UE 3GPP PS Data Off Status Reporting X.2.2 UE Provisioning X.2.3 UE Enforcement of 3GPP SIP-Based 3GPP PS Data Off Exempt Services X.3 Network Behaviour X.3.1 Network Update to 3GPP PS Data Off Exempted Services X.3.2 Network Enforcement of SIP-Based 3GPP PS Data Off Exempted Services Annex Y (Informative): Change history History

15 14 TS V ( ) Foreword This Technical Specification has been produced by the 3rd Generation Partnership Project (3GPP). The contents of the present document are subject to continuing work within the TSG and may change following formal TSG approval. Should the TSG modify the contents of the present document, it will be re-released by the TSG with an identifying change of release date and an increase in version number as follows: Version x.y.z where: x the first digit: 1 presented to TSG for information; 2 presented to TSG for approval; 3 or greater indicates TSG approved document under change control. y the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections, updates, etc. z the third digit is incremented when editorial only changes have been incorporated in the document.

16 15 TS V ( ) 1 Scope This document defines the stage-2 service description for the IP Multimedia Core Network Subsystem (IMS), which includes the elements necessary to support IP Multimedia (IM) services. ITU-T Recommendation I.130 [4] describes a three-stage method for characterisation of telecommunication services, and ITU-T Recommendation Q.65 [3] defines stage 2 of the method. This document does not cover the Access Network functionality except as they relate to provision of IM services, these aspects are covered in the normative Annex E for these accesses. This document identifies the mechanisms to enable support for IP multimedia applications. In order to align IP multimedia applications wherever possible with non-3gpp IP applications, the general approach is to adopt non-3gpp specific IP based solutions. 2 References The following documents contain provisions which, through reference in this text, constitute provisions of the present document. - References are either specific (identified by date of publication, edition number, version number, etc.) or non-specific. - For a specific reference, subsequent revisions do not apply. - For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document. [1] 3GPP TS : "Network Architecture". [2] CCITT Recommendation E.164: "Numbering plan for the ISDN era". [3] CCITT Recommendation Q.65: "Methodology Stage 2 of the method for the characterisation of services supported by an ISDN". [4] ITU Recommendation I.130: "Method for the characterization of telecommunication services supported by an ISDN and network capabilities of an ISDN". [5] 3GPP TS : "Network Domain Security (NDS); Authentication Framework (AF)". [6] Void. [7] 3GPP TS : "Architectural Requirements". [8] 3GPP TS : "Service requirements for the IP multimedia core network subsystem". [9] 3GPP TS : "End-to-end QoS concept and architecture". [10] Void. [10a] 3GPP TS : "IP Multimedia Call Control based on SIP and SDP; Stage 3". [11] 3GPP TS : "Policy and Charging Control over Rx reference point". [11a] 3GPP TS : "Policy control over Go interface". [12] IETF RFC 3261: "SIP: Session Initiation Protocol". [13] IETF RFC 3986: "Uniform Resource Identifiers (URI): Generic Syntax". [14] IETF RFC 4282: "The Network Access Identifier". [15] IETF RFC 3966: "The tel URI for Telephone Numbers".

17 16 TS V ( ) [16] IETF RFC 3761 (April 2004): "The E.164 to Uniform Resource Identifiers (URI) Dynamic Delegation Discovery System (DDDS) Application (ENUM)". [16a] IETF RFC 4941: "Privacy Extensions for Stateless Address Autoconfiguration in IPv6". [17] ITU Recommendation G.711: "Pulse code modulation (PCM) of voice frequencies". [18] ITU Recommendation H.248: "Gateway control protocol". [19] 3GPP TS : "Access Security for IP-based services". [20] 3GPP TS : "Network Domain Security: IP network layer security". [21] Void. [22] 3GPP TR : "IP Based Multimedia Services Framework". [23] 3GPP TS : "General Packet Radio Service (GPRS); Service description; Stage 2". [24] 3GPP TS : "Technical Specification Group Core Network; Numbering, addressing and identification". [25] 3GPP TS : "Telecommunication management; Charging management; Charging architecture and principles". [26] 3GPP TS : "Telecommunication Management; Charging Management; IP Multimedia Subsystem (IMS) charging". [27] 3GPP TS : "Technical Specification Group Services and System Aspects, Location Services (LCS); Service description, Stage 1". [28] 3GPP TS : "Technical Specification Group Services and System Aspects, Functional stage 2 description of LCS". [29] 3GPP TS : "Customised Applications for Mobile network Enhanced Logic (CAMEL) Phase 3 - Stage 2". [29a] 3GPP TS : "IMS Messaging; Stage 1". [30] 3GPP TS : "IP Multimedia (IM) Subsystem Cx and Dx Interfaces; Signalling flows and message contents". [31] 3GPP TS : "3GPP Generic User Profile - Architecture; Stage 2". [32] 3GPP TS : "IP Multimedia Subsystem (IMS) group management"; Stage 1". [33] IETF RFC 2766: "Network Address Translation-Protocol Translation (NAT-PT)". [34] IETF RFC 2663: "IP Network Address Translator (NAT) Terminology and Considerations". [35] Void. [36] 3GPP TS : "3rd Generation Partnership Project; Technical Specification Group Services and System Aspects; Presence Service". [37] Void. [38] IETF RFC 3840: "Indicating User Agent Capabilities in the Session Initiation Protocol (SIP)". [39] IETF RFC 3323: "A Privacy Mechanism for the Session Initiation Protocol (SIP)". [40] IETF RFC 3325: "Private Extensions to the Session Initiation Protocol (SIP) for Asserted Identity within Trusted Network". [41] IETF RFC 3312: "Integration of resource management and Session Initiation Protocol (SIP)". [42] IETF RFC 3841: "Caller Preferences for the Session Initiation Protocol (SIP)".

18 17 TS V ( ) [43] IETF RFC 3428: "Session Initiation Protocol (SIP) Extension for Instant Messaging". [44] IETF RFC 3263: "Session Initiation Protocol (SIP): Locating SIP Servers". [45] IETF RFC 5245: "Interactive Connectivity Establishment (ICE): A Protocol for Network Address Translator (NAT) Traversal for Offer/Answer Protocols". [46] IETF RFC 5766: "Traversal Using Relays around NAT (TURN): Relay Extensions to Session Traversal Utilities for NAT (STUN)". [47] IETF RFC 5389: "Session Traversal Utilities for NAT (STUN)". [48] IETF RFC 5626: "Managing Client Initiated Connections in the Session Initiation Protocol (SIP)". [49] IETF RFC 5627: "Obtaining and Using Globally Routable User Agent URIs (GRUUs) in the Session Initiation Protocol (SIP)". [50] IETF RFC 5628: "Registration Event Package Extension for Session Initiation Protocol (SIP) Globally Routable User Agent URIs (GRUUs)". [51] IETF RFC 4787: "Network Address Translation (NAT) Behavioural Requirements for Unicast UDP". [52] 3GPP TS : "Combining Circuit Switched (CS) and IP Multimedia Subsystem (IMS) services; Stage 2". [53] 3GPP TS : "IMS Multimedia Telephony Service and supplementary services; Stage 1". [54] 3GPP TS : "Policy and Charging Control architecture". [55] 3GPP TS : "Quality of Service (QoS) concept and architecture". [56] 3GPP TS : "Support of Short Message Service (SMS) over generic 3GPP Internet Protocol (IP) access". [57] IETF RFC 4769: "IANA Registration for an Enumservice Containing Public Switched Telephone Network (PSTN) Signaling Information". [58] 3GPP TS : "IP Multimedia Subsystem (IMS) emergency sessions". [59] 3GPP TS : "Multimedia Resource Function Controller (MRFC) - Multimedia Resource Function Processor (MRFP) Mp Interface; Stage 3". [60] 3GPP2 X.S0011: "cdma2000 Wireless IP Network Standard". [61] 3GPP2 C.S0001-D: "Introduction to cdma2000 Spread Spectrum Systems - Revision D". [62] 3GPP2 C.S0024-A: "cdma2000 High Rate Packet Data Air Interface Standard, April 2004". [63] 3GPP2 C.S : "Overview for Ultra Mobile Broadband (UMB) Air Interface Specification". [64] 3GPP TS : "3GPP IMS Management Object (MO); Stage 3". [65] IETF RFC 3022: "Traditional IP Network Address Translator (Traditional NAT)". [66] 3GPP TS : "IP Multimedia Subsystem (IMS) Centralized Services". [67] 3GPP TS : "IP Multimedia Subsystem (IMS) Service Continuity". [68] 3GPP TR : "Vocabulary for 3GPP Specifications". [69] 3GPP TS : "Characteristics of the IP Multimedia Services Identity Module (ISIM) application". [70] 3GPP TS : "General Packet Radio Service (GPRS) enhancements for Evolved Universal Terrestrial Radio Access Network (E-UTRAN) access". [71] 3GPP TS : "IP Multimedia (IM) session handling; IM call model; Stage 2".

19 18 TS V ( ) [72] IETF RFC 3264: "An Offer/Answer Model with Session Description Protocol". [73] 3GPP TS : "Multimedia Resource Function Controller (MRFC) - Multimedia Resource Function Processor (MRFP) Mp interface: Procedures Descriptions". [74] 3GPP TS : " IMS Application Level Gateway (IMS-ALG) - IMS Access Gateway (IMS- AGW) interface: Procedures Descriptions". [75] 3GPP TS : "Interworking between the IM CN subsystem and IP networks". [76] 3GPP TS : "IP Multimedia Subsystem (IMS); Multimedia Telephony; Media handling and interaction". [77] 3GPP TS : "Multimedia priority service". [78] ES : "Telecommunications and Internet converged Services and Protocols for Advanced Networking (TISPAN); Resource and Admission Control Sub-System (RACS): Functional Architecture". [79] 3GPP TS : "IP Multimedia (IM) Subsystem Sh Interface; Signalling flows and message contents". [80] 3GPP TS : "IP Multimedia Subsystem (IMS); IMS Restoration Procedures". [81] 3GPP TS : "Business trunking; Architecture and functional description". [82] 3GPP TS : "Architecture Enhancements for non-3gpp accesses". [83] 3GPP TS : "IP Multimedia (IM) Subsystem media plane security". [84] IETF Draft, draft-ietf-rtcweb-overview-13 "Overview: Real Time Protocols for Brower-based Applications". Editor's note: The above document cannot be formally referenced until it is published as an RFC. [85] W3C: "WebRTC 1.0: Real-time Communication Between Browsers", W3C Working Draft, 10 September 2013, Editor's note: The above document cannot be formally referenced until it is published as a candidate recommendation. [86] W3C: "Cross-Origin Resource Sharing", W3C Proposed Recommendation, 05 December 2013, [87] ITU-T Recommendation T.140: "Protocol for multimedia application text conversation". [88] IETF RFC 6455: "The WebSocket Protocol". [89] IETF RFC 7118: "The WebSocket Protocol as a Transport for the Session Initiation Protocol (SIP)". [90] IETF RFC 4571: "Framing Real-time Transport Protocol (RTP) and RTP Control Protocol (RTCP) Packets over Connection-Oriented Transport". [91] 3GPP TS : "Communication HOLD (HOLD) using IP Multimedia (IM) Core Network (CN) subsystem". [92] 3GPP TS : "Functional architecture and information flows to support mission critical communication services; Stage 2".

20 19 TS V ( ) 3 Definitions, symbols and abbreviations 3.1 Definitions Refer to TS [1] for the definitions of some terms used in this document. For the purposes of the present document the terms and definitions given in TR [68] and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in TR [68]. For the purposes of the present document, the following terms and definitions given in TS [24] apply: Distinct Public Service Identity Public User Identity Wildcarded Public User Identity Wildcarded Service User Identity Alias Public User Identities: A set of Public User Identities that belong to the same alias group as specified in TS [30]. ALG: Application Level Gateway (ALG) is an application specific functional entity that allows communication between disparate address realm or IP versions, e.g. an IPv6 node to communicate with an IPv4 node and vice versa, when certain applications carry network addresses in the payloads like SIP/SDP. NA(P)T-PT or NA(P)T is application unaware whereas ALGs are application specific translation entities that allow a host running an application to communicate transparently with another host running the same application but in a different IP version or IP address realm. See IETF RFC 2663 [34] for more details. For IMS, an IMS ALG provides the necessary application function for SIP/SDP protocols in order to communicate between different address realms or IP versions, e.g. IPv6 and IPv4 SIP applications. Distinct Public User Identity: used in relation to wildcarded Public User/Service Identities to denote an explicitly provisioned Public User/Service Identity. See more details in TS [24]. Entry point: In the case that border control concepts are to be applied in an IM CN subsystem, then these are to be provided by capabilities within the IBCF, and the IBCF acts as an entry point for this network (instead of the I-CSCF). In this case the IBCF and the I-CSCF can be co-located as a single physical node. If border control concepts are not applied, then the I-CSCF is considered as an entry point of a network. If the P-CSCF is in the home network, then the I-CSCF is considered as an entry point for this document. Exit point: If operator preference requires the application of border control concepts then these are to be provided by capabilities within the IBCF, and requests sent towards another network are routed via a local network exit point (IBCF), which will then forward the request to the other network (discovering the entry point if necessary). IP-Connectivity Access Network: refers to the collection of network entities and interfaces that provides the underlying IP transport connectivity between the UE and the IMS entities. An example of an "IP-Connectivity Access Network" is GPRS. Business trunking: as defined in TS [81]. Subscriber: A Subscriber is an entity (comprising one or more users) that is engaged in a Subscription with a service provider. The subscriber is allowed to subscribe and unsubscribe services, to register a user or a list of user authorized to enjoy these services, and also to set the limits relative to the use that users make of these services. Inter-IMS Network to Network Interface: The interface which is used to interconnect two IM CN subsystem networks. This interface is not constrained to a single protocol. Network Address Translation (NA(P)T): method by which IP addresses are mapped from one group to another, transparently to end users. Network Address Port Translation, or NA(P)T is a method by which many network addresses and their TCP/UDP (Transmission Control Protocol/User Datagram Protocol) ports are translated into a single network address and its TCP/UDP ports. See RFC 3022 [65] for further details. NAT-PT/NAPT-PT: NAT-PT uses a pool of globally unique IPv4 addresses for assignment to IPv6 nodes on a dynamic basis as sessions are initiated across the IP version boundaries. NAT-PT binds addresses in IPv6 network with addresses in IPv4 network and vice versa to provide transparent routing between the two IP domains without requiring

21 20 TS V ( ) any changes to end points, like the UE. NAT-PT needs to track the sessions it supports and mandates that inbound and outbound data for a specific session traverse the same NAT-PT router. NAPT-PT provides additional translation of transport identifier (e.g., TCP and UDP port numbers, ICMP query identifiers). This allows the transport identifiers of a number of IPv6 hosts to be multiplexed into the transport identifiers of a single assigned IPv4 address. See IETF RFC 2766 [33] for more details. Transport address: A unique identifier of transport-layer address, i.e. a combination of a network address, protocol identifier and port number. For example an IP address and a UDP port. IMS application: An IMS application is an application that uses an IMS communication service(s) in order to provide a specific service to the end-user. An IMS application utilises the IMS communication service(s) as they are specified without extending the definition of the IMS communication service(s). IMS application reference: An IMS application reference is the means by which an IMS communication service identifies an IMS application. IMS communication service: An IMS communication service is a type of communication defined by a service definition that specifies the rules and procedures and allowed medias for a specific type of communication and that utilises the IMS enablers. IMS communication service identifier: An IMS communication service identifier uniquely identifies the IMS communication service associated with the particular IMS request. IMC: IMS Credentials as defined in TR [68]. IMS enabler: An IMS enabler is a set of IMS procedures that fulfils specific function. An IMS enabler may be used in conjunction with other IMS enablers in order to provide an IMS communication service. Instance identifier: An identifier, that uniquely identifies a specific UE amongst all other UEs registered with the same Public User Identity. Local Service Number: A local service number is a telephone number in non international format. A local service number is used to access a service that may be located in the home network of the user (home local service number) or the roamed network of the user (geo-local service number). Geo-local service number: A local service number that is used to access a service in the roamed network (a local service where the subscriber is located). Home local service number: A local service number is used to access a service that is located in the home network of the user. IP Flow: Unidirectional flow of IP packets with the following properties: - same source IP address and port number; - same destination IP address and port number; - same transport protocol (port numbers are only applicable if used by the transport protocol). Media Flow: One or more IP flows carrying a single media instance, e.g., an audio stream or a video stream. In the context of this specification the term Media Flow is used instead of IP Flow regardless of whether the actual IP packet corresponds to media plane information (e.g. audio RTP flow) or control signalling (e.g. RTCP or SIP Signalling). MPS: Based on TS [77]. Multimedia Priority Service allows authorized users to obtain and maintain radio and network resources with priority, also during national security or emergency situations when PLMN congestion may occur. MPS session: A session (e.g., voice, video, data session) for which priority treatment is applied for allocating and maintaining radio and network resources. MPS-subscribed UE: A UE having a USIM with MPS subscription. Service User: According to TS [77].